{"id":"UBUNTU-CVE-2026-29076","details":"cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.37.0, cpp-httplib uses std::regex (libstdc++) to parse RFC 5987 encoded filename* values in multipart Content-Disposition headers. The regex engine in libstdc++ implements backtracking via deep recursion, consuming one stack frame per input character. An attacker can send a single HTTP POST request with a crafted filename* parameter that causes uncontrolled stack growth, resulting in a stack overflow (SIGSEGV) that crashes the server process. This issue has been patched in version 0.37.0.","modified":"2026-06-25T13:30:08.336578872Z","published":"2026-03-07T16:15:00Z","upstream":["CVE-2026-29076"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-29076"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-29076"},{"type":"REPORT","url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qq6v-r583-3h69"},{"type":"REPORT","url":"https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6"},{"type":"REPORT","url":"https://github.com/yhirose/cpp-httplib/releases/tag/v0.37.0"}],"affected":[{"package":{"name":"cpp-httplib","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/cpp-httplib?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.9+ds-1","0.9.10+ds-1","0.10.1+ds-1","0.10.2+ds-1","0.10.3+ds-1","0.10.3+ds-1ubuntu0.1~esm1","0.10.3+ds-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libcpp-httplib0","binary_version":"0.10.3+ds-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29076.json"}},{"package":{"name":"cpp-httplib","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/cpp-httplib?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.1+ds-1ubuntu1","0.14.3+ds-1","0.14.3+ds-1.1","0.14.3+ds-1.1build1","0.14.3+ds-1.1build2","0.14.3+ds-1.1ubuntu0.1~esm1","0.14.3+ds-1.1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.14.3+ds-1.1ubuntu0.1~esm2","binary_name":"libcpp-httplib0.14t64"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29076.json"}},{"package":{"name":"cpp-httplib","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/cpp-httplib?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.7-1","0.18.7-1ubuntu0.25.10.1","0.18.7-1ubuntu0.25.10.2"],"ecosystem_specific":{"binaries":[{"binary_name":"libcpp-httplib0.18","binary_version":"0.18.7-1ubuntu0.25.10.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29076.json"}},{"package":{"name":"cpp-httplib","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/cpp-httplib?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.7-1","0.26.0+ds-2ubuntu2","0.26.0+ds-2ubuntu3","0.26.0+ds-2ubuntu3+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcpp-httplib0.26","binary_version":"0.26.0+ds-2ubuntu3+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29076.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}